To install string on a Husqvarna weed eater, first remove the trimmer head, clear out any remaining old line, feed new trimmer line through the eyelets or channels in the head, secure the line using your model’s locking mechanism, and reattach the head. Most Husqvarna models use either a bump-feed or fixed-line system, and using the correct line diameter specified in your owner’s manual helps prevent damage to the trimmer head.

Identifying Your Husqvarna Trimmer Head Type

Before you begin restringing your Husqvarna weed eater, you need to identify which trimmer head type your model uses. Husqvarna manufactures several different head designs, and each requires a specific line-loading method. Using the wrong approach can result in the line not feeding properly or becoming tangled inside the head.

The most common head types found on Husqvarna trimmers include the T25 bump-feed head, the T35 rapid-loading head, and various fixed-line heads. Bump-feed heads allow you to advance more line by tapping the head on the ground while trimming. Fixed-line heads require you to manually replace the line each time it wears down, but they tend to be simpler to load.

You can usually identify your head type by examining the top of the trimmer head. Bump-feed heads typically have a spring-loaded button or bump knob in the center. Fixed-line heads often have pre-drilled holes or slots where short pieces of line are inserted. Your owner’s manual will specify the exact head type, and you can also check the model number printed on the head itself.

Knowing your head type matters because the line diameter and loading procedure differ between systems. For example, a T25 head typically accepts 0.080-inch or 0.095-inch line, while a T35 head may use slightly different specifications. Checking these details before purchasing replacement line saves time and ensures proper fit.

Removing the Trimmer Head

Removing the trimmer head gives you full access to the line channels and makes it easier to clear old line. Start by turning off the trimmer and disconnecting the spark plug wire if your model has a gas engine. For battery-powered models, remove the battery to prevent accidental starting.

Hold the trimmer shaft firmly and locate the retaining knob or bolt on the bottom of the head. Most Husqvarna models use a clockwise thread, meaning you turn the head counterclockwise to remove it. Some models have a locking tab or button you need to press while turning. If the head is stuck, a rubber mallet can help break it free without damaging the components.

Once the head is off, set it on a clean work surface. You should now be able to see the inner spool and line channels clearly. If your model has a separate inner and outer housing, you may need to separate these pieces to access the line winding area. Refer to diagrams in your owner’s manual if you are unsure how the components fit together.

Removing Old String

With the head removed, pull out any remaining old line from the eyelets or channels. For bump-feed heads, unwind the spool completely and discard the old line. If the line has become tangled or fused to the spool due to heat or age, you may need to use needle-nose pliers to grip and pull it free.

Check the inner spool for any debris, grass clippings, or dirt buildup. Cleaning the spool with a dry brush or compressed air helps the new line wind smoothly and feed properly. Inspect the eyelets for cracks or wear, as damaged eyelets can cause line to fray or break prematurely.

For fixed-line heads, simply pull the old line pieces out of the holes. If a piece has broken off deep inside and is difficult to grasp, use pliers or a small flathead screwdriver to work it out. Taking a few extra minutes to fully clear the old line prevents problems when loading the new string.

Measuring and Cutting New String

Selecting the correct line diameter is critical for your Husqvarna trimmer. Using line that is too thick can jam the head or put excessive strain on the motor, while line that is too thin may break frequently and cut less efficiently. Your owner’s manual specifies the recommended diameter for your particular model.

For most Husqvarna trimmers, common line diameters range from 0.065 inches to 0.095 inches. Heavier-duty models designed for thick brush may accept up to 0.105-inch line. Always check the specifications before purchasing, and buy line from a reputable source to ensure consistent diameter throughout the spool.

The length of line you need depends on your head type. Bump-feed heads typically require between 10 and 25 feet of line, wound onto the inner spool. Fixed-line heads use shorter pieces, usually 8 to 12 inches per hole. Measure twice and cut once using sharp scissors or line cutters to get clean, angled ends that feed easily through the eyelets.

Loading New String onto the Head

The loading procedure varies by head type, so follow the steps that match your specific Husqvarna trimmer head. For a T25 bump-feed head, locate the arrow markers on the inner and outer housing that indicate alignment. Rotate the outer housing until the arrows line up with the eyelets on opposite sides.

Feed one end of the new line through an eyelet and pull it through until equal lengths extend from both sides. Press the line into the center channel of the spool, then wind it in the direction indicated by the arrows on the spool. Keep the line taut as you wind to prevent loops or tangles. When you reach the end of the winding area, tuck the line ends into the notches on the spool rim to hold them in place temporarily.

For fixed-line heads, insert one piece of line into each hole, pushing it through until roughly equal amounts extend on both sides. Some fixed-line heads have a locking mechanism such as a set screw or clip that holds the line in position. Tighten or engage this mechanism securely to prevent the line from slipping out during use.

The T35 rapid-loading head simplifies the process by allowing you to feed both ends of the line through the eyelets, press a button, and let the internal mechanism wind the line automatically. If your Husqvarna uses this system, follow the specific instructions printed on the head or in your manual.

Reattaching the Trimmer Head

Once the new line is loaded, reassemble the head components if you separated them. Align the inner spool with the outer housing according to the manufacturer’s markings. For bump-feed heads, make sure the line ends are free and extending from the eyelets before securing the head back onto the trimmer.

Thread the head back onto the trimmer shaft by turning it clockwise. Hand-tighten it firmly, but do not overtighten, as this can strip the threads or damage the retaining mechanism. Press the locking tab or bolt into place if applicable.

Reconnect the spark plug wire or reinstall the battery. Start the trimmer and test the line feed by bumping the head on the ground while the trimmer runs. The line should advance smoothly with each bump. If the line does not feed, check that it is wound correctly and that the head is fully assembled. Trimming for a few seconds at a low speed helps settle the line into position.

Troubleshooting Common Issues

If the line does not feed after loading, the most common cause is incorrect winding direction. Unwind the spool and rewrap the line following the directional arrows. Another issue is line that is wound too tightly, which prevents the bump mechanism from releasing it. Wind the line with moderate tension instead.

Line that breaks immediately after loading may be the wrong diameter for your head, or it may be catching on a burr or sharp edge inside the eyelet. Inspect the eyelets and smooth any rough spots with fine sandpaper. Ensure the line diameter matches your Husqvarna model’s specifications.

If the line tangles inside the head, you may have overfilled the spool. Remove some of the wound line and try again, leaving a small gap between the line and the outer edge of the spool. Tangled line often results from loose winding or using line that is too stiff for the head design.